Right now there is so much first person documentation of these acts pouring into Twitter, Reddit, Snapchat's Map, and Tiktok. This is the time to make sure there is a simple way to document all of this so it can be organized later. System perfection is the enemy of preservation here. Anything helps and taking time to make those UI layers could lose valuable documentation in the shuffle.
Git's UI will absolutely limit the contributing audience, I agree - Perhaps the author could add a simple form for people to submit through and then technical people could manually add them? Google Form/Jotform/Survey Monkey style?